Feed mechanism for leather skiving and splitting machines.



PATENTED MAY 21, 1907.

A. HIRTH. FEED MECHANISM FOR LEATHER SKIVING AND SPLITTING MACHINES.

APPLICATION FILED JAN. 27, 1906.

2' SHEETS-SHEET 1.

ATTDRIVE YS.

Tu: NORRIS Prrslas co., WAsHlNriTulv, n. c.

PATENTED MAY 21, 1907.

A A. HIRTH. FEED MECHANISM FOR LEATHER SKIVING AND SPLITTING MACHINES.

APPLICATION FILED JAN. 27, 1906.

2 SHEETS-SHEET 2.

THE NORRIS PETERS cm, WASHINGTON n. c.

UNITED STATES PATENT UFFTQEQ ALB ER T HIRTI-I, or ,cAaiN sTATT, GERMANY.

FEED MECHANISM FOR LEATHER SKIVING AND SPLITTING MACHINES.

Application filed January 27,1906. Serial No. 298,260.

Specification of Letters Patent.

Patented May 21, 1907.

To all whom it may concern:

Be it known that I, ALBERT HIRTH, a citizen of the Empire of Germany, residing'in Cannstatt, near Stuttgart, in the Kingdom of Wurtemberg and Empire of Germany, have invented certain new and useful Improvements in SkivingMachines, of which the following is a specification.

This invention relates to machines for skiving and splitting leather, textile fabrics, pasteboard and other materials, and more particularly to machines of this type in which is embodied a ring-shaped cutting-knife.

The primary object of the invention is to provide an improved f eed-mechanism for use in machines of this description. The particular advantages of this feed-mechanism will be pointed out in connection with the following description in which, and in the claims, the novel features and arrangements of parts constituting the invention are set forth.

Inthe accompanying drawings, in which the same parts are denoted by the same reference characters throughout the several views, Figure 1 is a side-elevation of a skiving machine constructed in accordance with the invention, the frame and skiving knife being shown in section on line A, A, Fig. 2, and the mechanism for rotating the feed-roll omitted. Fig. 2 is afront-elevation of Fig. 1, Fig. 3 is an exaggerated illustration of the action of certain feed-mechanisms heretofore embodied in skiving machines, Fig. 4 is a detail of Fig. 2 and shows in full lines the position of rest, and in dotted lines the working position, of the feed-roll in relation to thering-knife of the improved machine, Fig. 5 shows on a larger scale the method of skiving in connection with the improved machine, Fig. 6 shows in elevation and partly in section the mechanism by which the feed-roll is rotated, and Fig. 7 is a detail of the mechanism shown in Fig. 6.

Referring to the drawings, and more particularly to Figs. 1 and'2, (1 denotes the boxlike frame of the machine, which has journaled therein a vertically rotatable ringshaped skiving knife I) of the usual construction. 1 denotes a gage which is supported above said knife. The material to be cut fed against the knife I) by means of a rotary feed-roll 0 located adjacent the upper portion of said knife. The horizontal shaft d of the feed-roll 0 extends at right angles to that of the knife I), and is supported at one end in a carrier-arm e which is curved away from a spindle 6 upon which said arm is mounted. The spindle e sleeve 6 in such a manner as to be inclined upwardly toward the upper edgeportion of the skiving knife, said spindle being located in a plane at right angles to the plane of rotation of said knife. The axis of oscillation f, f of the arm e does not intersect with the axis of the feed-roll, but passes through the point 9 at which one edge of the feed-roll forms contact with the knife in the plane of said edge. The sleeve 6 in which the spindle e is rotatably or rockably supported is carried by a lever "i which is pivoted 011 the horizontal line a, n in order to swing vertically and thus alter the vertical position of the feed-roll c, the carrier-spindle e being carried by the lever 71 at the upper part of the latter, just above the point of pivoting. The lever i may be adjusted by means of a screwnut 19 which is threaded upon a pin 19 which is swiveled to the lower end of the lever 11 and extends through the frame a. A helical spring 0 surrounds the pinp and is interposed between the frame and the lower extremity of the lever, thus normally holding up the feed-roll in contact with the skiving knife. the feed-roll laterally with respect to the knife, the spindle e carries at its outer lower end a depending lever 7r which is drawn by the tension of a spring Z toward a stationary stop on the frame a. A screw m passing laterally through the lever k abuts against a fixed part of the frame a and serves to adjust said lever, and the feed-roll, about the axis f, f inopposition to the spring Z. The adjustment of the feed-roll 0 about the point 9 at which the axis of oscillation of the feed-roll intersects with the edge of the cutting-knife, is indicated in Fig. l.

The mechanism by which the feed-roll is rotated is shown in Figs. 6 and 7. In said figures 1 denotes a shaft which is suitably journaled in the frame of the machine and is provided with spherical ends 2, 3. The spherical end 2 is provided with a cross-pin 4 which engages a slot 6 in a projection 8 formed on the shaft of the feed-roll c. The end 3 of the shaft 1 is connected by means of a cross-pin 5 with the head 9 of a stud-shaft 10 journaled in the side of the machine, this connection being made by a slot 7 formed in the head 9. The pins 4 and 5 extend at right angles to each other and hence the shaft 10 is connected with the shaft of the is supported rotatably in a In order to secure the adjustment of ISO feed-roll c by what is practically a universal joint. On the shaft 10 a worm-wheel 11 is mounted, and said wheel is driven by a worm 12, the axis 13 ings 16 arranged on the frame of the machine below said worm-wheel. driven by a pulley 15 which is connected by a cord or a suitable belt with a pulley 14 on the shaft of the ring-knife.

The operation of the machine is as follows: Referring to Fig. 5, 7 denotes the material to be operated upon and which is to be split or skived in any desired shape. This material is pressed by the feed-roll 0 against the gage'g, the form of which corresponds to the shape of the material to be skived or split. The material 7 is forced by the feed-roll and said gage against the cutting edge t of the ring-knife. The latter thereby removes the projecting material 1;. In certain feed-mechanisms the feed-roll c is arranged so as to oscillate on the end-point g of its central axis, as shown in Fig. 3. This arrangement is ob-' jectionable for the reason that the feed-roll, on being adjusted for working upon leather of different thicknesses, not only changes its position relatively to the ring-knife b, but also changes its position relatively to the circumference of the knife in lateral direction. Fig. 3 shows a somewhat exaggerated illustration or this action. Inasmuch as the feedroll 0 shifts in downward direction, according to the thickness of the removed paring or skiving, it changes simultaneously its position relatively to the knife from the point 8 to the point 8 It shows, therefore, that the paring or skiving out has a different breadth as often as the thickness of the leather changes, which occurs frequently, especially with this material, in one and the same piece. The imperfect skiving of the work thus produced. has to be supplemented by means of manual skiving, whereby the advantages of the machine skiving are lost to some extent. Another and much more serious objection, however, is found in the fact that in this arrangement the entire feed-roll is lifted away from the edge of the knife by the material to be skived, so that the reliable guiding of the material whichis fed to the-skiving machine is lost, and frequently portions of the material are' damaged by the ringknife.

The improved feed-mechanism herein set of which is supported in bear-- The worm 12 is.

forth obviates the above disadvantages. By said. mechanism the material is moved in a steady and reliable manner toward the ringknife, so that a uniform skiving action over the whole width of the material is secured, and a perfect skiving out, which requires no supplementary manual skiving, is obtained.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. In a skiving machine, a ring-knife, and a feed-roll mounted to oscillate about an axis which passes through one of the edges of said roll in the plane of said edge and through the cutting edge of said knife.

2. In a skiving machine, a ring-knife, a feed-roll having its axis perpendicular to that of said knife, said feed-roll contacting at one edge with the cutting edge of said knife, and means to rock said feed-roll about an axis passing through said edge thereof in the plane of said edge and through the cutting edge of said knife.

3. In a skiving machine, a ring-knife mounted to rotate in a vertical plane, a feedroll mounted to rotate in a plane at right angles to that of said knife, and contacting at one edge with the cutting edge of the lat ter, and means to adjust said feed-roll relatively to said knife on an axis located in a lane at right angles to the rotative plane of the latter and inclined upwardly in a line intersecting one edge of said feed-roll and the cutting edge of said knife.

4. In a skiving machine, the combination, with a ring-knife mounted to rotate in a vertical plane, of a lever pivoted to swing ver tically in a plane at right angles to the rotative plane of said knife, a sleeve carried by said lever and directed toward the cutting edge of said knife at the upper portion thereof, a spindle rockable in said sleeve, and a feed-roll having its shaft attached to said spindle and one side-edge alined with the axis of said spindle.

In testimony, that I claim the foregoing as my invention, I have signed my name 1n pres- 1 oo ence of two subscribing witnesses.

ALBERT HIRTH.

Witnesses:

ERNsT ENTENMANN, WM. HAHN. 

